Specify 'getting started with'. You can buy a microcontroller, program it in C and be completely oblivious to the architecture. If you want to understand RISC-V itself there's the specification, which is free and very readable.
I'll take a look at the RISC-V specification. Thanks!
Having spent a fair amount of time reading and referring to the specification, I definitely would not recommend it for someone who isn't familiar with assembly.
It is free though, so giving it a shot might be worth it.
I'm old - and binary is how one would bootstrap a new computer, and assembly was an hll.